JP6843593B2 - Segment joint structure - Google Patents

Description

The present invention relates to a segment joint structure.

In the shield method and the TMB method, a tunnel lining is formed by continuously installing tubular segment rings in the ground along with excavation of the ground.
The segment ring is formed by connecting the end faces of a plurality of segments. A fitting type joint structure is adopted as a connecting portion between such segments.

For example, Patent Document 1 discloses a joint structure of a segment for fitting an insertion fitting provided in one segment and a receiving fitting provided in the other segment. The insertion fitting is fixed to the concrete portion of one segment and protrudes from the end face (end plate) of one segment. The bracket is fixed to the concrete part of the segment.
Further, Patent Document 2 discloses a joint structure of a segment for fitting joint members provided in one segment and the other segment, respectively. Each joint member is not fixed to the end plate of the segment, but is fixed to a reinforcing rib provided substantially parallel to the end plate via an anchor member. Both ends of the reinforcing ribs are fixed to the main girder of the segment.

Japanese Patent No. 5335524 Japanese Unexamined Patent Publication No. 2012-241450

The joint structure described in Patent Document 1 is a structure in which a tensile force is transmitted to the main girder via concrete.
Since the joint structure described in Patent Document 2 is a structure in which a force is transmitted via the reinforcing ribs, the tensile spring value is calculated based on the distance between the reinforcing ribs of the respective segments facing each other across the joint structure. Since the tensile spring value is calculated from the cross-sectional area and length of the steel material constituting the joint structure, if the distance between the reinforcing ribs is large, the tensile spring value becomes small. Therefore, in the joint structure of Patent Document 2, it is necessary to increase the specifications of the segment in order to secure the rigidity required for lining the tunnel.

From such a viewpoint, it is an object of the present invention to propose a joint structure capable of increasing the rigidity of the joint portion.

In order to solve the above-mentioned problems, the present invention presents an insertion member provided in one segment of a segment having concrete cast in a steel shell to the other segment of the segment adjacent in the tunnel circumferential direction. It is a joint structure of a segment to be locked to a receiving member provided on an end face, the inserting member is directly fixed to the main girder of the one segment, and the receiving member is the main girder of the other segment. It is characterized in that the corners of the tunnel and the end plate are continuously opened in the tunnel axial direction and the tunnel circumferential direction .

Further, the insertion member includes an insertion plate portion fixed to the main girder of the one segment and an insertion locking portion protruding from the tip end portion of the insertion plate portion. At the corners of the main girder and the end plate of the other segment, the box-shaped receiving main body is continuously opened in the tunnel axial direction and the tunnel circumferential direction, and is fixed to the main girder. The insertion locking portion and the locking receiving portion that can be locked may be provided on the inner surface of the receiving main body portion.

According to the joint structure of such a segment, since the insertion member and the receiving member are fixed to the main girder, the tensile force can be directly transmitted to the main girder.
Further, by directly fixing to the main girder, it is possible to shorten the required lengths of the insertion member and the receiving member, thereby reducing the amount of steel material and obtaining a high tensile spring value.

According to the joint structure of the segment of the present invention, it is possible to reduce the cost and increase the rigidity of the joint portion, and it is also possible to reduce the cost due to the reduction of the amount of steel material.

It is a perspective view which shows the segment which concerns on embodiment of this invention. It is a perspective view which shows the attachment state of the insertion member and the receiving member. (A) is a partially enlarged view showing a part A in FIG. 1, and (b) is a partially enlarged view viewed from the back side of (a). It is a figure which shows the insertion member, (a) is a side view, (b) is a CC arrow view of (a), (c) is a DD arrow view of (a). (A) is a partially enlarged view showing a portion B of FIG. 1, and (b) is a partially enlarged view viewed from the back side of (a). It is a figure which shows the receiving member, (a) is a side view, (b) is the EE arrow view of (a), (c) is the FF sectional view of (a). (A) is a plan view of a receiving member according to another form, (b) is a sectional view taken along line GG of (a), (c) is a plan view of an insertion member according to another form, and (d) is (c). ) HH arrow view.

In the present embodiment, a joint structure (hereinafter, simply referred to as “joint structure 4”) of a segment for connecting concrete-integrated steel segments (hereinafter, simply referred to as “segment 1”) will be described (FIGS. 1 and FIG. 2).
As shown in FIG. 1, the segment 1 is formed in a plate shape curved in an arc shape, and a segment ring (not shown) is formed by connecting a plurality of segments 1 in the circumferential direction. When the segment rings are sequentially joined in the axial direction, a tunnel lining is formed.
The segment 1 of the present embodiment is composed of the steel shell 2 and the concrete 3 cast in the steel shell 2.

The steel shell 2 has a pair of main girders 21 and 21 provided at both ends in the tunnel axial direction (only one main girder 21 is shown in FIG. 1) and a pair of end plates 22 provided at both ends in the tunnel circumferential direction. , 22 (only one end plate 22 is shown in FIG. 1) and a skin plate 23 covering the outer surface.
The main girders 21 and 21 and the end plates 22 and 22 are assembled in a frame shape, and the skin plate 23 closes the outer peripheral surface side (ground side) of the openings of the main girders 21 and 21 and the end plates 22 and 22. It is arranged like this.

A plurality of shape-retaining members 24, 24, ... Are arranged inside the steel shell 2. The shape-retaining material 24 is a plate material arranged along the tunnel axial direction so as to be parallel to the end plate 22. The shape-retaining material 24 is erected on the skin plate 23. Further, both ends of the shape-retaining material 24 are in contact with the plate surfaces of the main girders 21 and 21, respectively.
A plurality of inter-ring joints 25, 25, ... Are formed on the main girder 21. The inter-ring joint 25 connects the segment rings to each other. The configuration, arrangement, and number of the ring-to-ring joints 25 are not limited, and may be appropriately set.

A rectangular through hole 26 is formed at one end of the end plate 22 in the tunnel axial direction (see FIG. 3), and a rectangular notch 27 is formed at the other end (FIG. 3). 5). That is, through holes 26 or notches 27 are formed at both ends of the end plate 22 corresponding to the positions of the joint structure 4.
The main girder 21 is formed with a rectangular notch 28 corresponding to the position of the notch 27 of the end plate 22 (see FIG. 5). An opening is formed at a corner of the segment 1 by the notch 27 of the end plate 22 and the notch 28 of the main girder 21.

The concrete 3 includes a surface layer portion 31 formed on the inner surface side of the segment 1 with a predetermined thickness, and an internal concrete portion 32 cast inside the steel shell 2.
Further, a reinforcing bar 33 is embedded in the surface layer portion 31 as a reinforcing material. In this embodiment,
As the reinforcing material, a reinforcing bar net formed by assembling reinforcing bars in a grid pattern is adopted, but the reinforcing bars 33 do not necessarily have to be a net, and vertical bars and horizontal bars may be appropriately arranged. Reinforcing bars may also be arranged in the internal concrete portion 32 (inside the steel shell 2).

The joint structure 4 includes an insertion member 5 and a receiving member 6. As shown in FIG. 2, the segments 1 are joined to each other by locking the insertion member 5 projecting from the end face of one segment 1 to the receiving member 6 formed on the end face of the other segment 1. ..
As shown in FIG. 1, the joint structure 4 (inserting member 5 and receiving member 6) of the present embodiment is formed near the center of the steel shell 2 in the thickness direction, but the forming location of the joint structure 4 is limited. It's not something. Further, the joint structure 4 may be formed in a plurality of stages.

As shown in FIGS. 3A and 3B, the insertion member 5 projects from the end face (end plate 22) of the segment 1.
The insertion member 5 includes an insertion plate portion 51 fixed to the main girder 21 of the segment 1 and an insertion locking portion 52 projecting from the tip end portion of the insertion plate portion 51.

The insertion plate portion 51 is formed of a steel plate and penetrates through the through hole 26 of the end plate 22. The base end portion of the insertion plate portion 51 is welded to the main girder 21 inside the steel shell 2.
As shown in FIG. 4, the insertion plate portion 51 is formed so that the width dimension on the base end portion side (the portion arranged in the steel shell 2) becomes smaller toward the base end, and has a trapezoidal shape. It is presented. The insertion plate material 51 does not necessarily have to be trapezoidal, and may be, for example, rectangular. Further, the plate thickness of the insertion plate material 51 is not limited as long as it can exhibit the strength required for joining the segments 1 to each other. Further, the method of fixing the insertion plate member 51 to the main girder 21 is not limited.

The insertion locking portion 52 is a steel member fixed to the plate surface of the insertion plate portion 51. In the present embodiment, the pair of insertion locking portions 52, 52 are welded to the insertion plate portion 51 so as to face each other with the tip portion (the portion protruding from the end surface of the segment 1) of the insertion plate portion 51 sandwiched between them. ..
The insertion locking portion 52 of the present embodiment is formed of a square columnar steel member, but the material constituting the insertion locking portion 52 is not limited, and is, for example, a columnar member or a plate material. There may be.
As shown in FIG. 4C, the insertion locking portion 52 is slightly inclined with respect to the tip surface of the insertion plate portion 51, but the insertion locking portion 52 is parallel to the tip surface of the insertion plate portion 51. It may be.

As shown in FIGS. 5A and 5B, the receiving member 6 is formed on the end face (circumferential end portion) of the segment 1.
The receiving member 6 includes a receiving main body portion 61, a receiving locking portion 62, and a reinforcing member 63, and is arranged inside the steel shell 2.
The receiving main body 61 is a box-shaped member fixed to the corners of the main girder 21 and the end plate 22 of the segment 1, and is opened at the corners in the tunnel axial direction and the tunnel circumferential direction. There is.

The receiving main body 61 of the present embodiment is formed by combining a plurality of steel plates. The receiving main body 61 is fixed (welded) to the inner surfaces of the main girder 21 and the end plate 22 so as to cover the notches 27 and 28 formed at the corners of the main girder 21 and the end plate 22. The receiving main body 61 may be fixed (welded) to at least the main girder 21 and does not necessarily have to be fixed to the end plate 22. The method of fixing the receiving main body 61 is not limited.
As shown in FIGS. 6A to 6C, the receiving main body 61 includes a pair of plate members 64, 64 facing each other and a pair of bottom plates 65 laid horizontally on the base end side of the pair of plate members 64, 64. It is formed by the plate members 64, 64 and the stopper plate 66 that shields the inner end portion of the bottom plate 65. The bottom plate 65 is parallel to the end plate 22, and the stop plate 66 is parallel to the main girder 21 (see FIGS. 5A and 5B).
The configuration of the receiving main body 61 is not limited.

The receiving locking portion 62 is a member that can be locked with the insertion locking portion 52, and is formed on the inner surface of the receiving main body portion 61.
The receiving locking portion 62 is composed of a pair of square columnar steel members welded to the facing surfaces of the pair of plate members 64, 64. The material constituting the receiving locking portion 62 is not limited, and may be, for example, a columnar member or a plate material.
As shown in FIG. 6C, the receiving locking portion 62 is slightly inclined with respect to the tip surface of the receiving main body 61, but the receiving locking portion 62 is parallel to the tip surface of the receiving main body 61. It may be.

As shown in FIG. 5B, the reinforcing member 63 is fixed to the main girder 21 of the segment 1 at the base end portion of the receiving main body portion 61.
The reinforcing material 63 is a steel plate arranged at the corners of the receiving main body 61 (bottom plate 65) and the main girder 21, and is welded to the bottom plate 65 and the main girder 21. As shown in FIG. 6C, the reinforcing material 63 of the present embodiment is formed in a triangular shape so that the height decreases as the distance from the receiving main body 61 increases, but the reinforcing material 63 has a rectangular shape. There may be.

When joining the segments 1, as shown in FIG. 2, the tip of the insertion member 5 of one segment 1 is inserted into the receiving member 6 of the other segment 1 through the opening facing the main girder 21. At the same time, it is shifted in the tunnel axis direction (direction intersecting with the main girder 21). At this time, the insertion locking portion 52 of the insertion member 5 slides along the reinforcing member 63 side of the receiving locking portion 62 of the receiving member 6.

According to the joint structure 4 of the present embodiment, since the insertion member 5 and the receiving member 6 are fixed to the main girder 21, the tensile force can be directly transmitted to the main girder 21. Therefore, the degree of fixation between the segments 1 is high.
Further, by fixing the insertion member 5 and the receiving member 6 to the main girder 21, the free length of the joint structure 4 (the length of the unfixed portion) is shortened, so that the tensile spring value of the joint is high and the joint portion High rigidity. Therefore, the deformation of the tunnel outer shell can be suppressed.
Further, by fixing the insertion member 5 and the receiving member 6 to the main girder 21, the amount of steel material constituting the joint structure 4 can be minimized, which is economical.

Since the insertion plate portion 51 is formed in a trapezoidal shape, the amount of steel material used is reduced as compared with the case where the insertion plate portion 51 has a rectangular shape.
Similarly, since the reinforcing material 63 is formed in a triangular shape, the amount of steel material used is reduced as compared with the case where the reinforcing material 63 has a rectangular shape.
Further, by directly fixing to the main girder 21, the required lengths of the inserting member 5 and the receiving member 6 can be shortened, the amount of steel material can be reduced, and a high tensile spring value can be obtained.
Since the reinforcing member 63 is formed at the base end portion of the receiving main body portion 6, the degree of fixation with the main girder 21 is improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and each of the above-mentioned components can be appropriately modified without departing from the spirit of the present invention.
In the above embodiment, the case where the joint structure 4 is applied to the concrete integrated steel segment has been described, but the segment to which the joint structure 4 can be applied is not limited to this, and for example, a steel segment or other composite. It may be adopted for the segment.

In the above embodiment, the case where the receiving member 62 has the reinforcing member 63 has been described, but the reinforcing member 63 may be formed as needed. Further, in the above-described embodiment, the case where one reinforcing member 63 is arranged has been described, but a plurality of reinforcing members 63 may be arranged.
Further, in the above-described embodiment, the case where the receiving member 6 is formed by combining steel materials has been described, but the configuration of the receiving member 6 is not limited, and is shown in FIGS. 7 (a) and 7 (b), for example. As described above, it may be integrally molded by forging.
Further, the receiving main body 61 may have a C-shape in cross section.

In the above embodiment, when the insertion member 5 is formed by combining steel materials, the configuration of the insertion member 5 is not limited, and for example, as shown in FIGS. 7 (c) and 7 (d), the insertion member 5 is formed by forging. It may be integrally molded.
Further, in the above-described embodiment, the case where the cross-sectional shape of the insertion member 5 is cross-shaped (t-shaped) has been described, but the cross-sectional shape of the inserting member 5 is not limited, and even if it is T-shaped, for example. Good (see FIG. 7 (c)).

In the above embodiment, the case where both the insertion member 5 and the receiving member 6 are formed on the end surface of the segment 1 has been described, but one of the insertion member 5 and the receiving member 6 is formed on the end surface of the segment 1. Only may be formed.
Further, in the segment 1, in the segment 1, only one of the insertion member 5 and the receiving member 6 may be formed on both end faces. In this case, the segment 1 in which only the insertion member 5 is formed and the segment 1 in which only the receiving member 6 is formed may be arranged alternately.

1 Segment 2 Steel shell 21 Main girder 22 End plate 23 Skin plate 3 Concrete 4 Joint structure 5 Insertion member 51 Insertion plate part 52 Insertion locking part 6 Receiving member 61 Receiving body part 62 Receiving locking part 63 Reinforcing material

Claims (2)

A segment that locks an insertion member provided in one segment of a segment having concrete cast in a steel shell to a receiving member provided in the end face of the other segment of the segment adjacent in the tunnel circumferential direction. It is a joint structure of
The insertion member is directly fixed to the main girder of the one segment.
The receiving member is continuously opened in the tunnel axial direction and the tunnel circumferential direction at the corner portion between the main girder and the end plate of the other segment.
The segment joint structure is characterized by that. A segment joint structure in which an insertion member projecting from the end face of one segment of a segment having concrete cast in a steel shell is locked to a receiving member formed on the end face of the other segment of the segment. And
The insertion member is
An insertion plate fixed to the main girder of one of the segments,
It is provided with an insertion locking portion projecting from the tip of the insertion plate portion.
The receiving member
At the corners of the main girder and the end plate of the other segment, the box-shaped receiving main body is continuously opened in the tunnel axial direction and the tunnel circumferential direction, and is fixed to the main girder.
A segment joint structure, which is formed on an inner surface of the receiving main body portion and includes the insertion locking portion and a locking receiving portion that can be locked.

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